Question:
The Gemara says that if the man orgasms first, then the child will be a girl and if the woman orgasms first, then the child will be a boy. If someone has a bunch of girls and wants to have a boy, can he be motzei zerah so that when he is with his wife afterwards, it will take longer and she will orgasm first so that the child will be a boy or is that called zerah levatalah r”l?
Answer:
The gemorah says “Mazraas Techilah” we don’t know the exact interpretation. It is forbidden to motzei zerah for such a purpose.
Sources:
Niddah 25b
